CGRG Bibliography of Canadian Geomorphology
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Author : Ashmore, P.; Best, J.; Czuba, J.; Denny, J.; Foster, D.; Oberg, K.; Garcia, M.; Liu, X.; Parker, G.; and Parsons, D.
Date : 2010.
Title : Morphology, sedimentology and dynamics of the upper St. Clair River.
Publication : Lessons from the Past. Solutions for the Future. AGLR 2010. 53rd International Conference on Great Lakes Research. May 17-21, 2010. Toronto, Ontario.
Issue : Abstract Book.
Page(s) : 12.
Abstract
Recent video and acoustic surveys of the upper St. Clair River, as part of the International Upper Great Lakes Study, have revealed new information about the geology, morphology and substrate of this unusual, non-alluvial, river. The upper 1-2 km of the river is underlain by a considerable thickness of fluvio-glacial gravel, which thins downstream, with clay till beneath. The river bed is dominated by this coarse gravel-cobble material but, where this deposit thins-out, glacial till is exposed in some areas. Bed material grain size appears to be in equilibrium with prevailing flows, transport of the gravel is minimal and sediment load is restricted to low intensity background sand flux and suspension of fines in the lake. Features of the bed include local scour around obstacle (e.g. ship wrecks), deep pools in the bends, linear grooves and ridges in till, and some areas of transverse bed waves in gravel and sand. Hydraulic and grain size analysis indicates that much of the bed material is not erodible under present flow conditions, leading to the hypothesis that the bed waves and ridge-groove features are related to propeller wash and other ship effects that disturb the bed.
Bibliography of Canadian Geomorphology